package util;

import java.io.UnsupportedEncodingException;
import java.util.Random;

public class StringRandomUtils {

	 private Random widthRandom = new Random();
	    private int length;
	    private static char[] charsNumber = ("0123456789").toCharArray();
	    private static char[] charsLetter = ("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ").toCharArray();
	    private static char[] charsRandom = ("0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ").toCharArray();
	    private static Random random = new Random();
	    private final static int[] areaCode = {1601, 1637, 1833, 2078, 2274,
	            2302, 2433, 2594, 2787, 3106, 3212, 3472, 3635, 3722, 3730, 3858,
	            4027, 4086, 4390, 4558, 4684, 4925, 5249, 5590};
	    private final static String[] letters = {"a", "b", "c", "d", "e",
	            "f", "g", "h", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s",
	            "t", "w", "x", "y", "z"};

	    //参数为生成的字符串的长度，根据给定的char集合生成字符串数字
	    public static String randomNumber(int length) {

	        char[] data = new char[length];

	        for (int i = 0; i < length; i++) {
	            int index = random.nextInt(charsNumber.length);
	            data[i] = charsNumber[index];
	        }
	        String s = new String(data);
	        return s;
	    }

	    //参数为生成的字符串的长度，根据给定的char集合生成字符串、字母
	    public static String randomLetter(int length) {

	        char[] data = new char[length];

	        for (int i = 0; i < length; i++) {
	            int index = random.nextInt(charsLetter.length);
	            data[i] = charsLetter[index];
	        }
	        String s = new String(data);
	        return s;
	    }

	    //参数为生成的字符串的长度，根据给定的char集合生成字符串
	    public static String getStringRandom(int length) {

	        char[] data = new char[length];

	        for (int i = 0; i < length; i++) {
	            int index = random.nextInt(charsRandom.length);
	            data[i] = charsRandom[index];
	        }
	        String s = new String(data);
	        return s;
	    }

	    //简体中文
	    public static String getRandomJianHan(int length) {
	        String ret = "";
	        for (int i = 0; i < length; i++) {
	            String str = null;
	            int hightPos, lowPos;//定义高地位
	            Random random = new Random();
	            hightPos = (176 + Math.abs(random.nextInt(39))); //获取高位值
	            lowPos = (161 + Math.abs(random.nextInt(93))); //获取低位值
	            byte[] b = new byte[2];
	            b[0] = (new Integer(hightPos).byteValue());
	            b[1] = (new Integer(lowPos).byteValue());
	            try {
	                str = new String(b, "GBK");//转成中文
	            } catch (UnsupportedEncodingException ex) {
	                ex.printStackTrace();
	            }
	            ret += str;
	        }
	        return ret;
	    }

	    /*封装成带下划线的蓝色文本*/
	    public static String toBlueTextUnderLine(String text) {
	        return "<u><font color=\"#15ABF9\">" + text + "</font></u>";
	    }


	    /**
	     * 获取汉字的首字母
	     * @param x
	     * @return
	     */
	    public static String getFirstAlp(String x) {

	        String chinese = x.substring(0,1);

	        if (chinese == null || chinese.trim().length() == 0) {
	            return "";
	        }
	        chinese = conversionStr(chinese, "GB2312", "ISO8859-1");

	        if (chinese.length() > 1) // 判断是不是汉字
	        {
	            int li_SectorCode = (int) chinese.charAt(0); // 汉字区码
	            int li_PositionCode = (int) chinese.charAt(1); // 汉字位码
	            li_SectorCode = li_SectorCode - 160;
	            li_PositionCode = li_PositionCode - 160;
	            int li_SecPosCode = li_SectorCode * 100 + li_PositionCode; // 汉字区位码
	            if (li_SecPosCode > 1600 && li_SecPosCode < 5590) {
//	                ToastUtils.showShort(MyApplication.getContext(),"chinese 是汉字字符");
	                for (int i = 0; i < 23; i++) {
	                    if (li_SecPosCode >= areaCode[i]
	                            && li_SecPosCode < areaCode[i + 1]) {
	                        chinese = letters[i];
	                        break;
	                    }
	                }
	            } else // 非汉字字符,如图形符号或ASCII码
	            {
//	                ToastUtils.showShort(MyApplication.getContext(),"chinese 不是汉字！！");
	                chinese = conversionStr(chinese, "ISO8859-1", "GB2312");
	                chinese = chinese.substring(0, 1);
	            }
	        }
	        return chinese;
	    }


	    /**
	     * 字符串编码转换
	     *
	     * @param str           要转换编码的字符串
	     * @param charsetName   原来的编码
	     * @param toCharsetName 转换后的编码
	     * @return 经过编码转换后的字符串
	     */
	    private static String conversionStr(String str, String charsetName, String toCharsetName) {
	        try {
	            str = new String(str.getBytes(charsetName), toCharsetName);
	        } catch (UnsupportedEncodingException ex) {
	            System.out.println("字符串编码转换异常：" + ex.getMessage());
	        }
	        return str;
	    }
}
